There are two changes that can be observed when we mix substances together and this is either physical or chemical changes. A chemical reaction involves the rearrangement of the molecular structure of a substance. Test out your understanding of chemical reactions by taking up the quiz below. All the best and come back for more quizzes like these to aid in your revision.
Hydrogen
ZnO
Zinc Sulphite
Nitrogen
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The test tube becomes cold due to release of heat energy
The test tube becomes hot due to release of heat energy
The test tube becomes hot due to absorption of heat energy
The test tube becomes cold due to absorption of heat energy
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Cu and Al2(SO4)3
CuO and Al2(SO4)3
Cu, Al2S3 and SO2
CuO, Al2S3 and SO2
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Hydrogen gas and iron chloride are produced.
Chlorine gas and iron hydroxide are produced.
No reaction takes place.
Iron salt and water are produced.
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(i) , (iii)
(ii), (iii)
(iii)
(ii), (iv)
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(i) and (ii)
(ii) and (iii)
(i) and (iv)
(iii) and (iv)
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(i) and (ii)
(ii) and (iii)
(i) and (iv)
(iii) and (iv)
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1:2 by volume
2:1 by volume
8:1 by mass
1:2 by mass
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(i) and (ii)
(ii) and (iii)
(i) and (iv)
(iii) and (iv)
(i) and (ii)
(i) and (iii)
(i), (ii) and (iii)
(iv) only
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0,2,2,3
1,3,2,3
1,2,2,2
2,6,4,3
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KMnO4 is oxidizing agent, it oxidizes FeSO4
FeSO4 acts as an oxidizing agent and oxidizes KMnO4
The color disappears due to dilution: no reaction is involved
KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colorless compound.
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